Previous medication, duration of illness and placebo response.
D002707:Chlordiazepoxide / Q000627:therapeutic use*; D002986:Clinical Trials as Topic; D006801:Humans; D008620:Meprobamate / Q000627:therapeutic use*; D010634:Phenobarbital / Q000627:therapeutic use*; D010919:Placebos; D011600:Psychopharmacology
D010919:Placebos; D002707:Chlordiazepoxide; D008620:Meprobamate; D010634:Phenobarbital